| addy field ecological new technology of planting and breeding is accounted for a new type of ecological intercropping mode, it is a kind of typical three-dimensional ecological agriculture. Its characteristic is in a certain area of land (or water), according to the various plants, animal, microbial growth reproductive characteristics and biological characteristics, make full use of time, space, light, heat and water resource potential, applying modern science and technology, the planting, breeding and relevant processing ably combined to form the many species coexistence, multi-level configuration, multilevel energy circulation transformation of the stereo cultivation, breeding and supporting technology, make limited water resources and rich light, heat resource coordinates, to realize the economic, social and ecological three benefits is harmonious and unified.Integrated rice-crab ecological new technology is a paddy field mid-tenperate new technology development of ecological accounted for the most perfect a variety of raising new technology mode, has shows its great advantages in production and development potential. It for stable grain production, improving people food structure, farmers of well-off society and improving national quality has the positive role. The crab-culturing paddy rice is planting and aquaculture should be combined to form a grain safety, food safety, ecological safety, and increase farmers’ income, enterprise comprehensive industry. Rice crab ecological accounted for new technology is the rice paddy in grow rice, due to the introduction of the giant rose, the ecological environment of the rice paddies, including rice will change the water environment, spatial resources, soil physical and chemical properties, soil nutrient and soil microbes, rice, etc. However, the related rice crab ecological accounted for new technology increasing efficiency of studying the mechanism, just little giant in paddy water quality, rose on rice kept density and have some weeds control and prevention, researchers report also nothing about rice crab altogether effectively resist and soil physical and chemical properties. therefore, nutrient paper to paddy soil physical and chemical properties and soil nutrient as the starting point, effective from paddy soil were some of the changes to explore rice crab ecological accounted for new technology, so as to increase efficiency mechanism crab-culturing paddy fields and promote the further research to provide the reference. Test set three treatments: 1) no crab-culturing paddy, 2) Intensive rice-crab culture, the crabs in which was fed on high-protein(30%) formula feed and living food, 3) the same as intensive rice-crab culture, except the crab was only fed on low-protein (20%) formula feed, Each treatment set three parallel. The main research results are as follows:1、The rice ecosystem crab, crab presence, soil physical and chemical nature of the very significant changes in the whole period of rice and crab farming, intensive care rice paddy and coarse soil NH4+ content was 65±40.12 mg/kg and 63.4±40.21 mg/kg, was significantly higher than crab paddy soil NH4+ (P <0.05), while the soil NO3- was not significant; decreased soil pH, a significant increase in the diameter of >0.2mm soil aggregates the content of the body, significantly reducing the size <0.002mm grain size content of the soil micro-aggregates, rice water stable aggregates increased, enhancing the degree of soil aggregates; decrease soil bulk density, improve the soil texture.2、Rice and crab farming paddy soil significantly increased the total nitrogen content (P <0.05), intensive care rice and coarse rice to increase by 4.0%～6.8% and 9.0%～12.5%; significant difference in soil phosphorus content, not crab paddy soil total P content of 64.8±16.76 mg/kg, was significantly lower than 72.4±11.55 mg/kg intensive paddy rice and coarse raised 70.47±10.76 mg/kg (P <0.05), intensive total phosphorus in paddy soil also significantly higher than that of coarse rice raised (P <0.05); in the whole period of rice and crab farming, soil available phosphorus content was significantly increased by 5.25%～13.37% and 3.1%～11.46%. not crab paddy soil available phosphorus content was 14.13±4.34 mg/kg, was significantly lower than intensive rice 14.8±3.99 mg/kg and crude raising rice 14.63±4.57 mg/kg (P <0.05). rice and crab symbiosis also significantly increased the potassium content, fine Yang Yang paddy rice and coarse rice crab were not increased compared with 6.25%～11.73% and 5.58%～9.59%, the difference was significant (P <0.05). Compared to the paddy field crab, due to the presence of crab, crab seek food and other activities, turning the soil, increase soil permeability, promote microbial activity, thus contributing to soil redox reactions, significantly increased the soil organic matter content (P <0.05), to promote the growth of rice, prompting crab rice yield efficiency. |
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